9978972 has 24 divisors (see below), whose sum is σ = 23527056. Its totient is φ = 3291648.

The previous prime is 9978961. The next prime is 9978989. The reversal of 9978972 is 2798799.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3123 + ... + 5450.

It is an arithmetic number, because the mean of its divisors is an integer number (980294).

Almost surely, 2^9978972 is an apocalyptic number.

It is an amenable number.

9978972 is an abundant number, since it is smaller than the sum of its proper divisors (13548084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9978972 is a wasteful number, since it uses less digits than its factorization.

9978972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8677 (or 8675 counting only the distinct ones).

The product of its digits is 571536, while the sum is 51.

The square root of 9978972 is about 3158.9510917392. The cubic root of 9978972 is about 215.2923515215.

The spelling of 9978972 in words is "nine million, nine hundred seventy-eight thousand, nine hundred seventy-two".